CN102901877A - Noncontact measurement device and method for measuring electrical conductivity of electrolyte solution by using coaxial coils - Google Patents
Noncontact measurement device and method for measuring electrical conductivity of electrolyte solution by using coaxial coils Download PDFInfo
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- CN102901877A CN102901877A CN2012104495748A CN201210449574A CN102901877A CN 102901877 A CN102901877 A CN 102901877A CN 2012104495748 A CN2012104495748 A CN 2012104495748A CN 201210449574 A CN201210449574 A CN 201210449574A CN 102901877 A CN102901877 A CN 102901877A
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Abstract
The invention relates to a noncontact measurement device for measuring electrical conductivity of an electrolyte solution by using coaxial coils, which is used for measuring the electrical conductivity of the electrolyte solution of which the electrical conductivity sigma is in a certain range being less than 10s/m. The device comprises a personal computer (PC) host, a field programmable gate array (FPGA) main board, a front end board and a sensor device which are sequentially connected through a circuit, and a measurement pipeline for holding the electrolyte solution to be measured; wherein the sensor device comprises an exciting coil and a receiving coil wound on the measurement pipeline in parallel to form coaxial coils. The invention also provides a noncontact measurement method for measuring the electrical conductivity of the electrolyte solution. The device and the method are used for measuring the electrical conductivity of the electrolyte solution of which the electrical conductivity sigma is in a certain range being less than 10s/m, and the electrical conductivity of the electrolyte solution can be conveniently and accurately detected in real time by directly detecting induction signals on the receiving coil under the conditions that the device is not in contact with the measured electrolyte solution and normal use is not affected.
Description
Technical field
The present invention relates to a kind of coaxial coil that utilizes to non-contact measurement apparatus and the method for electrolyte solution conductivity, refer to that specifically a kind of coaxial coil that utilizes to non-contact measurement apparatus and the method for the electrolyte solution conductivity of conductivity in σ＜10s/m scope, belongs to the real-time detection technique of fluid field.
Background technology
Conductivity is one of the parameter of the key property of reaction electrolyte solution, is widely used in water quality monitoring, medical and health, scientific research and the industrial process.Current, compare with the metal material that conductivity is higher, owing to be subjected to the impact of the factors such as self CONCENTRATION DISTRIBUTION, unstable form, temperature, realize that there is certain difficulty in measuring accurately and rapidly of electrolyte solution conductivity.
In the prior art, the method that detects the electrolyte solution conductivity comprises the electrode conductance mensuration, and the capacitive coupling Conductometric Method For Determination.Wherein, the electrode conductance mensuration in actual measurement owing to there is more limitation in its singularity.Because this method belongs to contact type measurement, can tested electrolyte solution fluid be damaged to a certain extent; And there be long-term the contact with electrolyte solution of electrode and the problem such as be corroded.
And described capacitive coupling Conductometric Method For Determination is because measuring principle and the restriction of measuring the order of magnitude, therefore morely still is used in the measurement of the miniature scale pipelines such as capillary and to measure range also less than normal.
Summary of the invention
The purpose of this invention is to provide a kind of coaxial coil that utilizes to non-contact measurement apparatus and the method for electrolyte solution conductivity, can not contact with tested electrolyte solution, do not affect in the situation of normal use, can make things convenient for accurately real-time detection to obtain the conductivity of this kind electrolyte solution by the induced signal on the direct-detection receiving coil.
For achieving the above object, the invention provides a kind of coaxial coil that utilizes to the non-contact measurement apparatus of electrolyte solution conductivity, be used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, this device comprises: the PC main frame, FPGA mainboard, front end-plate and the sensor device that connect successively by circuit, and the measuring channel that is used for placing electrolyte solution to be measured; Wherein, described sensor device comprises parallel winded at drive coil and the receiving coil in the described measuring channel outside, forms coaxial coil.
The radius of described measuring channel is 10mm.
Equal coiling 50 circles of described drive coil and receiving coil, coiling spacing between the two is 20mm, and resonant frequency is 25MHz, and impedance is 15 ohm.
The surface of described sensor device adopts oxirene plastic packaging aluminium-foil paper parcel with as screen layer.
Described FPGA mainboard comprises: the USB interface that is connected by circuit with described PC main frame, Direct Digital Frequency Synthesizers, totalizer, microprocessor, the digital to analog converter that is connected by circuit with described Direct Digital Frequency Synthesizers, and the analog to digital converter that is connected by circuit with described totalizer.
Described front end-plate comprises: be connected the analog switch that circuit is connected with receiving coil with described drive coil respectively, and the power amplifier and the signal preprocessor that are connected by circuit with described analog switch; Wherein, described power amplifier also is connected by circuit with analog to digital converter; Described signal preprocessor also is connected by circuit with digital to analog converter; Described analog switch also is connected by circuit with microprocessor, and the logic control signal that sends according to microprocessor carries out gating to pumping signal and induced signal.
The present invention also provides a kind of method of utilizing above-mentioned measurement mechanism that the electrolyte solution conductivity is measured, and the method be used for to be measured the conductivity of the electrolyte solution of conductivity the particular range of σ＜10s/m in, and need carry out under normal temperature, airtight environment; Described method mainly comprises following steps:
Step 1, tested electrolyte solution is injected measuring channel;
Step 2, PC main frame send enabling signal via USB interface to Direct Digital Frequency Synthesizers, device preheating 10 minutes;
Step 3, microprocessor send logic control signal to analog switch, and pumping signal is strobed; Described Direct Digital Frequency Synthesizers generates original excitation signal by frequency synthesis, and carry out the signal digital-to-analog conversion by digital to analog converter, after processing through the power amplification of power amplifier again, analog switch via gating applies pumping signal to drive coil, by tested electrolyte solution so that receiving coil produces induced signal;
Step 4, microprocessor send logic control signal to analog switch, and induced signal is strobed; After the induced signal that produces on the described signal preprocessor direct-detection receiving coil amplifies pre-service, transfer to analog to digital converter and carry out the signal mode number conversion, transfer to again accumulator computes, finally transfer to the PC main frame by USB interface and show testing result.
In sum, the coaxial coil that utilizes provided by the present invention is to non-contact measurement apparatus and the method for electrolyte solution conductivity, be used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, can not contact with tested electrolyte solution, do not affect in the situation of normal use, can make things convenient for accurately real-time detection to obtain the conductivity of this kind electrolyte solution by the induced signal on the direct-detection receiving coil.
Description of drawings
Fig. 1 utilizes coaxial coil to the structural representation of the non-contact measurement apparatus of electrolyte solution conductivity among the present invention
Fig. 2 is the circuit structure diagram of the front end-plate among the present invention.
Embodiment
Below in conjunction with Fig. 1～Fig. 2, describe a preferred embodiment of the present invention in detail.
As shown in Figure 1, the coaxial coil that utilizes provided by the present invention is to the non-contact measurement apparatus of electrolyte solution conductivity, be used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, it comprises: the PC main frame 1, the FPGA(field programmable gate array that connect successively by circuit) mainboard 2, front end-plate 3 and sensor device, and the measuring channel that is used for placing electrolyte solution to be measured.
The radius of described measuring channel is 10mm.
Described sensor device comprises parallel winded at drive coil 41 and the receiving coil 42 in the described measuring channel outside, forms coaxial coil.Described drive coil 41 and receiving coil 42 equal coiling 50 circles, coiling spacing between the two is 20mm, and resonant frequency is 25MHz, and impedance is 15 ohm.Further, the surface of described sensor device adopts oxirene plastic packaging aluminium-foil paper parcel with as screen layer.
Described FPGA mainboard 2 comprises: the USB interface 26 that is connected by circuit with described PC main frame 1, the DDS(Direct Digital Frequency Synthesizers) 21, totalizer 24, the MCU(microprocessor) 25, the digital to analog converter 22 that is connected by circuit with described DDS 21, and the analog to digital converter 23 that is connected by circuit with described totalizer 24.Described DDS 21 receives the enabling signal that PC main frame 1 sends by USB interface 26, generates original excitation signal by frequency synthesis, and carries out the signal digital-to-analog conversion by digital to analog converter 22.After 23 pairs of induced signals that detect of described analog to digital converter gather and carry out the signal mode number conversion, transfer to totalizer 24 and calculate, finally transfer to PC main frame 1 by USB interface 26 and show testing result.
In the present embodiment, it is the modulus conversion chip of AD9266 that described analog to digital converter 23 adopts model, and its sample frequency is
=50MHz selects frequency of operation to be
=2.5MHz.The excitation frequency of described FPGA mainboard 2 and survey frequency all between 1～5MHz, in order to improve the spatial sensitivity of signal, reduce high frequency interference simultaneously.
Described front end-plate 3 comprises: are connected the analog switch 31 that is connected by circuit with receiving coil with described drive coil 41 respectively, and the power amplifier 32 and the signal preprocessor 33 that are connected by circuit with described analog switch; Wherein, described power amplifier 32 also is connected by circuit with analog to digital converter 22; Described signal preprocessor 33 also is connected by circuit with digital to analog converter 23; Described analog switch 31 also is connected by circuit with MCU 25, and the logic control signal that sends according to MCU 25 carries out gating to pumping signal and induced signal.
As shown in Figure 3, in the present embodiment, it is that 74C906 and model are the integrated circuit (IC) chip realization of OPA544 that described power amplifier 32 adopts model, is used for receiving the pumping signal that is sent by DDS 21, and this pumping signal is carried out power amplification.It is that INA105 and model are the integrated circuit (IC) chip realization of INA104 that described signal preprocessor 33 adopts model, be used for to receive the induced signal that the receiving coil 42 by sensor device detects and amplify pre-service, again this induced signal is transferred to analog to digital converter 23.Wherein, the ic core piece collection difference-mode input pattern of described INA1049.
The present invention also provides a kind of method of utilizing above-mentioned measurement mechanism that the electrolyte solution conductivity is measured, the method is used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, need under normal temperature, airtight environment, to carry out, to avoid the interference of temperature and high-frequency signal; Described method mainly comprises following steps:
Step 1, tested electrolyte solution is injected measuring channel;
Step 2, PC main frame 1 send enabling signal via USB interface 26 to DDS 21, device preheating 10 minutes;
Step 3, MCU 25 send logic control signal to analog switch 31, and pumping signal is strobed; Described DDS 21 generates original excitation signal by frequency synthesis, and carry out the signal digital-to-analog conversion by digital to analog converter 22, after processing through the power amplification of power amplifier 32 again, analog switch 31 via gating applies pumping signal to drive coil 41, by tested electrolyte solution so that receiving coil 42 produces induced signals;
Step 4, MCU 25 send logic control signal to analog switch 31, and induced signal is strobed; After the induced signal that produces on the described signal preprocessor 33 direct-detection receiving coils 42 amplifies pre-service, transfer to analog to digital converter 23 and carry out the signal mode number conversion, transfer to again totalizer 24 and calculate, finally transfer to PC main frame 1 by USB interface 26 and show testing result.
In sum, the coaxial coil that utilizes provided by the present invention is to non-contact measurement apparatus and the method for electrolyte solution conductivity, be used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, can not contact with tested electrolyte solution, do not affect in the situation of normal use, can make things convenient for accurately real-time detection to obtain the conductivity of this kind electrolyte solution by the induced signal on the direct-detection receiving coil.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. one kind is utilized coaxial coil to the non-contact measurement apparatus of electrolyte solution conductivity, it is characterized in that, is used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, and this device comprises:
The PC main frame (1), FPGA mainboard (2), front end-plate (3) and the sensor device that connect successively by circuit, and the measuring channel that is used for placing electrolyte solution to be measured;
Wherein, described sensor device comprises parallel winded at drive coil (41) and the receiving coil (42) in the described measuring channel outside, forms coaxial coil.
2. the coaxial coil that utilizes as claimed in claim 1 is characterized in that the non-contact measurement apparatus of electrolyte solution conductivity, and the radius of described measuring channel is 10mm.
3. the coaxial coil that utilizes as claimed in claim 1 is to the non-contact measurement apparatus of electrolyte solution conductivity, it is characterized in that described drive coil (41) and receiving coil (42) be coiling 50 circles all, coiling spacing between the two is 20mm, resonant frequency is 25MHz, and impedance is 15 ohm.
4. the coaxial coil that utilizes as claimed in claim 3 is characterized in that the non-contact measurement apparatus of electrolyte solution conductivity, and the surface of described sensor device adopts oxirene plastic packaging aluminium-foil paper parcel with as screen layer.
5. the coaxial coil that utilizes as claimed in claim 1 is to the non-contact measurement apparatus of electrolyte solution conductivity, it is characterized in that, described FPGA mainboard (2) comprises: the USB interface (26) that is connected by circuit with described PC main frame (1), Direct Digital Frequency Synthesizers (21), totalizer (24), microprocessor (25), the digital to analog converter (22) that is connected by circuit with described Direct Digital Frequency Synthesizers (21), and the analog to digital converter (23) that is connected by circuit with described totalizer (24).
6. the coaxial coil that utilizes as claimed in claim 5 is to the non-contact measurement apparatus of electrolyte solution conductivity, it is characterized in that, described front end-plate (3) comprises: be connected 42 with described drive coil (41) with receiving coil respectively) analog switch (31) that is connected by circuit, and the power amplifier (32) and the signal preprocessor (33) that are connected by circuit with described analog switch;
Described power amplifier (32) also is connected by circuit with analog to digital converter (22);
Described signal preprocessor (33) also is connected by circuit with digital to analog converter (23);
Described analog switch (31) also is connected by circuit with microprocessor (25), and the logic control signal that sends according to microprocessor (25) carries out gating to pumping signal and induced signal.
7. one kind is utilized coaxial coil to the contactless measurement of electrolyte solution conductivity, be used for measuring the conductivity of the electrolyte solution of conductivity in the particular range of σ＜10s/m, need under normal temperature, airtight environment, to carry out, it is characterized in that described measuring method comprises following steps:
Step 1, tested electrolyte solution is injected measuring channel;
Step 2, PC main frame (1) send enabling signal via USB interface (26) to Direct Digital Frequency Synthesizers (21), device preheating 10 minutes;
Step 3, microprocessor (25) send logic control signal to analog switch (31), and pumping signal is strobed; Described Direct Digital Frequency Synthesizers (21) generates original excitation signal by frequency synthesis, and carry out the signal digital-to-analog conversion by digital to analog converter (22), after passing through again the power amplification processing of power amplifier (32), analog switch (31) via gating applies pumping signal to drive coil (41), by tested electrolyte solution so that receiving coil (42) produces induced signal;
Step 4, microprocessor (25) send logic control signal to analog switch (31), and induced signal is strobed; After the upper induced signal that produces of described signal preprocessor (33) direct-detection receiving coil (42) amplifies pre-service, transfer to analog to digital converter (23) and carry out the signal mode number conversion, transfer to again totalizer (24) and calculate, finally transfer to PC main frame (1) by USB interface (26) and show testing result.
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| CN2012104495748A CN102901877A (en) | 2012-11-12 | 2012-11-12 | Noncontact measurement device and method for measuring electrical conductivity of electrolyte solution by using coaxial coils |
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| CN2012104495748A CN102901877A (en) | 2012-11-12 | 2012-11-12 | Noncontact measurement device and method for measuring electrical conductivity of electrolyte solution by using coaxial coils |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777196A (en) * | 2014-12-03 | 2015-07-15 | 中国航天科工集团第三研究院第八三五七研究所 | Device for real-time measurement of fluid conductivity by use of electromagnetic method |
| CN105911360A (en) * | 2016-04-13 | 2016-08-31 | 中山市博测达电子科技有限公司 | Noncontact type solution conductivity testing device and noncontact type solution conductivity testing method |
| CN109341908A (en) * | 2018-11-01 | 2019-02-15 | 中南大学 | With the method for flexible pressure-sensitive coil measurement pressure and contactless displacement |
| CN109387549A (en) * | 2017-08-02 | 2019-02-26 | 施耐德电子系统美国股份有限公司 | For determining the industrial stokehold transmitter of solution concentration |
| CN114034929A (en) * | 2021-11-12 | 2022-02-11 | 国家海洋技术中心 | Non-external field inductive conductivity sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777196A (en) * | 2014-12-03 | 2015-07-15 | 中国航天科工集团第三研究院第八三五七研究所 | Device for real-time measurement of fluid conductivity by use of electromagnetic method |
| CN105911360A (en) * | 2016-04-13 | 2016-08-31 | 中山市博测达电子科技有限公司 | Noncontact type solution conductivity testing device and noncontact type solution conductivity testing method |
| CN109387549A (en) * | 2017-08-02 | 2019-02-26 | 施耐德电子系统美国股份有限公司 | For determining the industrial stokehold transmitter of solution concentration |
| CN109341908A (en) * | 2018-11-01 | 2019-02-15 | 中南大学 | With the method for flexible pressure-sensitive coil measurement pressure and contactless displacement |
| CN114034929A (en) * | 2021-11-12 | 2022-02-11 | 国家海洋技术中心 | Non-external field inductive conductivity sensor |
| CN114034929B (en) * | 2021-11-12 | 2024-04-19 | 国家海洋技术中心 | Non-external field induction type conductivity sensor |
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Application publication date: 20130130 |